It has been 17 years since the United States committed forces, making it the longest war in US history. Financially this war has cost the USA about $1 trillion -- but who is counting? At $1 trillion it would be the second costliest war in American history, second only to World War II.
The original aims of the United States, following the Al-Qaeda inspired attacks on 9/11/2001, were to attack Al-Qaeda by removing the Taliban from power in Afghanistan.
The US was joined by NATO allies. To date, approximately 3,546 NATO soldiers have been KIA, including 2,350 US troops killed. Approximately 20,000 US forces have been injured in Afghanistan and returned to the US. Were the war to stop today, the cost of medical care to these injured Americans for the rest of their lives will be approximately $1 trillion. (Afghanistan Veterans in America consider veteran suicide to be their first priority.)
At present approximately 15,000 US troops are deployed. The Taliban continues to control 45% of Afghanistan territory.
Some may recall that Donald Trump campaigned on a promise to withdraw US forces completely from Afghanistan. In office, President Trump's policies have not differed appreciably from those of Presidents Obama and Bush.
Locally, I see there are efforts to send "care packages" to US forces in Afghanistan ("please no pork and no chocolate").
Unlike earlier wars, there has been no conscription: it's "all volunteer". There have been no specific tax increases, and no "Victory Bond" drives. So, I believe the average American is easily distracted from the costs of this war. Either you know someone who has been deployed, or you don't. Personally, FWIW, I went ahead and sent chocolate to a deployed son of a friend. Much to my relief he came home well, as far as I am aware. (But the harm can be insidious, I know.)
I must add that approximately 217,000 Afghans have died in the conflict since the US got involved. The Trump administration policy has been to increase the bombing.
Afghanistan is the country where empires go to die.